<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        async function demo() {
            console.log('aaaaaaaaaaaa');
            await 111;
            console.log('bbbbbbbbbbbbb');
            return 777;
        }
        demo()
        .then(res => console.log('000000000000', res))
        console.log('this is outside');
        /*
            aaaaaaaaaaaa
            this is outside
            bbbbbbbbbbbbb
            000000000000 777
        */
    </script>
</body>
</html>